A man accused of driving his car into a Massachusetts State Police cruiser, killing Trooper Thomas Clardy in March, faces numerous charges in connection with the crash, including manslaughter and operating under the influence of drugs.

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David Njuguna, 30, of Webster, was indicted by a Worcester County grand jury Wednesday and was charged with manslaughter, manslaughter by motor vehicle, motor vehicle homicide by negligence, motor vehicle homicide (operating under the influence of drugs), negligent operation and operating an uninsured vehicle.

Njuguna pleaded not guilty and a judge set his bail at $500,000. The case was continued to June 30 for a pretrial conference.

Clardy, 44, of Hudson, was killed March 16 when Njuguna's car swerved across three lanes of traffic and slammed into the back of Clardy's cruiser on the Mass Pike in Charlton. Clardy, a former Marine, was married and a father of seven.

Clardy was performing a traffic stop in the westbound lanes of the Mass Pike when his vehicle was hit. Clardy's vehicle was pushed off the highway and was heavily damaged.

He was taken to a hospital, where he was pronounced dead.

Officials said they believe Njuguna's vehicle was traveling 81 mph at the time of impact. Njuguna was also taken to a hospital with serious injuries and his license was revoked.

In court Wednesday, prosecutors said Njuguna purchased three marijuana joints at a medical dispensary an hour before the crash.

"Testing as part of the investigation will reveal the defendant had an active THC level in his bloodstream at the time of the collision," prosecutors said.

Officials said one partially smoked marijuana joint was found in Njuguna's car after the crash.

"We do have evidence that there was THC within his blood, and that he should not have been operating at that level," Worcester County District Attorney Joseph Early said.

Gov. Charlie Baker's office said in a statement that he has serious concerns about the negative effects associated with the proliferation of marijuana use.

"Evidence shows that legalization leads to harm, especially among young people, and (Baker) hopes the person responsible for this tragic incident is prosecuted to the fullest extent of the law," Baker's office said.

Baker's office said he is working hard with a bipartisan group of public officials to oppose the legalization of marijuana that would "lead to expanded use as the Commonwealth fights the deadly opioid and heroin epidemic."

Early said he did not believe the crash was intentional.

"Everything we have in the investigation so far does not point to an intentional accident," he said. "I know that rumor has been out there, but let me dispel that right now."